Is 4x + 7 = 15 an expression, equation or formula?
Expression
Equation
Formula
What is the value of p if y = -3 in the equation p = 8 + 3y?
p = -1
\[p = \frac{-11}{3}\]
p = 17
What is the value of z if y = 2 in the equation 2z + 5y = 9?
z = 1
z = 0.5
z = -0.5
What is the value of u if v = 10, a = 3 and t = 2 in the formula v = u + at?
6
4
16
Three sisters are given pocket money based on their ages. Ann is n years old, Beth is two years older and Caitlin is twice as old as Ann. Which is an expression showing the total amount of pocket money received by the girls?
4n + 2
3n + 2
3n + 16
The three angles of a triangle are x + 20°, 2x + 50° and 3x - 10°. Which of the answers is an equation showing this information?
3x + 60° = 180°
6x + 60° = 180°
6x + 60°
The three angles of a triangle are x + 20°, 2x + 50° and 3x - 10°. What is the value of x?
x = 60
x = 40
x = 20
How can you make x the subject of the formula 3x + 2y = 7?
\[x = \frac{(7 - 2y)}{3}\]
3x = 2y + 7
\[x = \frac{(2y + 7)}{3}\]
How can you make x the subject of the formula \(\sqrt{2xy} = 4\)?
\[x = \frac{4}{y}\]
x = 8y2
\[x = \frac{8}{y}\]
How can you make x the subject of the formula xy + 3 = xm?
\[x = \frac{(m - 3)}{y}\]
\[x = \frac{3}{(m - y)}\]
\[x = \frac{(m-y)}{3}\]